SF34 WING STRIKES PARKED VEHICLE WHILE UNDER MARSHALLER CTL AT MSP.

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WE DEPARTED GATE X ON THE RAMP AT MSP. THERE WAS A PARKED SHUTTLE BUS LOCATED TO OUR L ON THE TAXI OUT NEAR GATE Y. A WING WALKER ON OUR L WING IN FRONT OF THE BUS WAS HOLDING 2 LIGHTED WANDS SLIGHTLY ABOVE HIS HEAD IN THE VERT 'CLR' POS VISIBLE TO BOTH THE CAPT AND FO. SEEING THE LIGHTED WANDS IN THE 'CLR' POS; SEEING WE WERE ON THE TAXI CTRLINE AND EVEN SLIGHTLY TO THE R OF IT; AND VERIFYING 'CLR L AND CLR R;' WE CONTINUED TO TAXI AT THE NORMAL; SLOW TAXI SPD. OUR L WINGTIP ENTERED THE TOP FRONT FIBERGLAS PORTION OF THE SHUTTLE BUS. AFTER SHUTTING DOWN THE ACFT; THE FLT ATTENDANT LOWERED THE AIRSTAIR WITH APPROVAL FROM THE CAPT. A RAMPER (I BELIEVE TO BE THE ONE WITH THE WANDS) ENTERED THE FLT DECK. AFTER A LONG PAUSE HE SAID; 'AH...OOPS.' HE LEFT WITH NO FURTHER DISCUSSION. VISUAL INSPECTION IMMEDIATELY AFTERWARDS (WITHIN 10 MINS) REVEALED THE L WINGTIP NAV LIGHTS AND LENS TO BE BROKEN. NO OTHER DAMAGE WAS VISIBLE. I BELIEVE THE RAMPER WAS RELATIVELY NEW AS I DID NOT RECOGNIZE HIM WHEN HE ENTERED THE FLT DECK. IT IS MY BELIEF THAT HE THOUGHT THE WING WOULD PASS OVER THE BUS.